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Anomalous Kinetics of Depletion Zone Growth with One-Dimensional Geometry: Photobleaching Experiments and Simulations

Published online by Cambridge University Press:  01 February 2011

Hailin Peng ,
Sung Hyun Park ,
Haim Taitelbaum  and
Raoul Kopelman
Hailin Peng
Affiliation:
Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
Sung Hyun Park
Affiliation:
Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
Haim Taitelbaum
Affiliation:
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
Raoul Kopelman
Affiliation:
Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
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Abstract

We studied the kinetics of a diffusion-limited trapping reaction A + T → T in an effective one-dimensional geometry by experiments, supported by simulation calculations. The experiments are based on the photobleaching reaction of fluorescein dyes. The main parameter of interest is the θ-distance, which is related to the expansion of the depletion zone and can be measured directly from experiment. We found that θ-distance scales with t1/2 asymptotically, as predicted by previous theory. In addition, we found that the θ-distance increases faster than t1/2 inside the trap at early times, which has not been explored previously. Furthermore, there is a third, intermediate regime, with a slow increase of slope. Our experimental results are consistent with our simulation results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 790: Symposium P – Dynamics in Small Confining Systems–2003 , 2003 , P7.15
Copyright
Copyright © Materials Research Society 2004

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References

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